Brake system for vehicles



March 6, 1928.

F; H. ROYCE BRAKE SYSTEM FOR VEHICLES Filed Feb. 5. 1926 gvwentoac Patented Mar. 6, 1928.

UNITED STATES PATENTOFFICE.

rnnnnnrcx HENRY ROYCE, or wE's'r WI'JJTERING, NEAR orrronnsrnn, ENGLAN AS- srenon r0 no Ls-RoYon LIMITED, or NIGH'IINGYALEHROAD,DERBY, ENGLAND.

BRAKE SYSTEM FOR VEHICLES.

Application filed February 5, 1926, Serial No. 86,159%,.and in Great Britain February 5, 1925. i

One form of device adopted for the purpose consists of a three-arm T-shaped lever,

one arm of which is operable by the operator and the other arms are operably; connected to the front and back wheel brakes respectively. The three arm lever is fulcrulned and rocks 011 a pivot or other suitable sup-.

port at a suitable place within the triangle formed by the pointsof attachment of the several arms to their respective operating and operated devices; and the pivot or sup-.

port is attached to one'end of a link, which link is at the other end hinged to the frame, so that when the lever is operated by the driver and in its turn operates the brakes,

if greater resistance is offered by one set of brakes and its intermediate mechanism than by the other, the three arm lever will move bodily the link swinging until the resist ances are equal.

In brake systems comprising such a device, as described, in the initial stages of applying the brakes, owing to the difliculty of equalizing resistances, the desired functioning of the lever is or may be disturbed, the play of forces may, owing to the fulcrum being adaptable, cause the three arm lever to fulcrum or rock in the first instance around an attachment or support other than the true fulcrum. The object ofthis in vention is to overcome this drawback, and to render the balancing device more efficient in other ways.

According to this invention I introduce between the link and the frame a friction device, which may take any suitable form in which relatively moving members are put into frictional engagement: for example by an arrangement as illustrated in the drawings hereinafter referred to.

In the accompanying drawings is illustrated an example of my invention.

F ig. 1 is a diagrammatic view of the chassis in elevation. Fig. 2 is a view of the upper end of the link in the direction of arrow 2 in Fig. l, and Fig. 3 is a section on line 3-3 of Fig. 2.

i i I I 1,661,963

a a and a are the rigidly connected arms of a three-arm lever respectively attached otiv i'-ll' 1*" l f l f L c opera) c casts a am a o tlO. rent and back wheel brakes and theoperating rods (1.", by either of which the three-arm lever is operated. The brake red A is suitably connected to the'rods'a to control the operation of all the brakes. I

v Z; is the swinging link on which the three arm lcver is fulcrumed at b and which is suspended on a pivot b projcctedfrom the frame; 0 is the boss ofthe linkwvith a split or gap 0 andwith (formed integral there with) perforated bosses c (Z is a bolt pass- "ing through the perforationsycl andfd are washers threaded on such bolt, 45 is a spiral spring reacting between such washers, and al a nut securing theassemblys Preferably there is a clearance between the bolt and the walls of the perforations, and the head of the bolt and the washer (Z are provided with spherical faces which fit corresponding spherical sockets in the bosses 0 It could be arranged for the spring to be betweenthe head of the bolt and one of the bosses 0 and it might be arranged to dispense with the washers d and d By apparatus made according to this invention the link can be made to temporarily maintain its position and the three arm lever accordingly to rock on the true fulcrum during the initial movements of the brake members.

What I claim is 1. In a four wheel brake system, the combination with aframe having wheels journaled thereto at opposite ends thereof, and

brakes controlling" the rotation of said wheels, of a brake rod pivoted to said frame, a link having one end thereof pivoted to said frame, means for varying the friction between said link and said frame, a lever pivoted intermediate its ends to the free end of said link, an arm extending rigidly from said lever, means operably connecting the opposite ends of said lever to the brakes at opposite ends of said frame, and means connecting said rod to the free end of said'arm to control the application of the brakes to all of said wheels.

2. In a four wheel brake system, the combination with a framehaving wheels journaled therein at opposite ends thereof, brake mechanism controlling the rotation of said pin extending: from said frame, a link having at one end thereof a split sleeve rotatable on said pin, means connected to the splitaendsuof saidsleeve togvary the friction 6 between said sleeve and saidlpin, and means trolled wheels at opposite ends thereof, of

a pivot pin extending laterally from said frame, a. cylindrical sleeve on said pin and havinga slot cut=therethrough parallel to the axis thereof, said sleeve being provided with apertured bosses on opposite sides of said slot," a boltiext-ending throughthe apertures of said bosses, and having a head engaging oneiof Isaid bosses, zrnnt screwthreaded on "thelshanktof said belt a coil spring interposedxbetweenthenut and the other boss, a: rodfixed to said sleeve and extending radially therefrom, and means pivoted to the free end of said rod and to the brakes of said wheelsato controlthe operation of saidbrakes. K a

l 4.. In'afour Wheel brake system, the combination iwith'aaframehaving brake controlled :wheels at opposite ends thereof, a

brake rod, pivotejtl to said frame, means connected to said 'rod* "to -operate"all of said brakes simultaneously, said means including a link having one end pivoted to said frame,

adjustable means for i'csisting the swing of said link about its pivotal connection to the frame, alever ivoted between its ends to the free end said link, means pivotally connecting the o positei ends 50f thetlever to the brakes at tie opposite ends of said frame, an arm extending rigidly from said lever at its pivotal connection with said link, and means connectingsaid brake rod to the free end of said arm to operate said lever and brake control means connected thereto. i

5. t In a four wheel brake system, the combination with a frame having brake'controlledwheels at o posite ends thereof, of

mechanism on said rame for simultaneously of the pivoted end of said link with said frame. y

In witness whercofuI have signed this specification.

FREDERICK I-IENRY- Boron 

